Hydraulic jack



April 6 1926. ,579,913

H. E. BRONSON HDRAULIG JACK Fileq DasV 51 AM /emm `Patented Apr. 6, 1926.

UNITED STATES PATE A 1,579,913A NTv OFFICE.

-mamrfn BaoNsoN, or Tacoma, wasnmeron.

mammie u cx. Y'

appnfm mea December s1, 192s. sena; ne. esame.

To all when?. t may concern:

Be it known that I, HARRY E. BRoNsoN, a`

-citizen of the United States, residing at the cles of any nature. The objects of my inand liable/to injury or failure. In my inven.--

`or get out `of order.

i 1, to which is :to receive the actuatin ceivm vention are, lirst, to provide a hydraulic jack equally as powerful, has less weight and is more durable than similar jacks now made; second, totmake `a hydraulic'jack that is more simple in construction, and third, to secure a hydraulic jack that is promptA in action and adaptable to various uses.'

I attain these objects lby means ofthe device illustrated in the laccompanying drawinin whichigure 1 is a vertical section of the jack;

Figure 2 is a plan section on the line 2-2;

Figure 3 is an enlarged view of the check-l valve" disk hereinafter referred to. f

' Similar ,characters refer to similar parte of the several views. b Y Heretofore hydraulic jacks have been more or less clumsy in construction and their operating mechamism Isomewhat complex tion I have devised a hydraulic vjack that is. easily constructed with the simplest and' most direct mechanism, all of w ich, including the power liquid, is enclose within the body of the jack'where it cannot be injured My inventionJ has a groundorbase late razed or electric welde "an upright cylind '112 constitutingy a chamber liqfuid and'also ree o the ram.v Insi this cylinder 2 'fs ac drical member 3 on the lower en d of whic is' threaded a piston head 4, the'cylindrical or hollow ram l,member 3 being supported or carried by the piston head. AOn the under 'sideof thisf iston head 4; is fitted ,a packing: ring orgas et 5 securely heldA in 'soA against the piston head ofthe ram the-latter in lifting the load. X

place by an annular diske threadedon a central part of the piston head 4, all. of which may be seen in Figure 1. The space 7 between the piston head 4 and-bottom of tlievclylinder 2 forms/the chamber receiving the I-y'drai-lic. agent or liquid that acts to lift Screw 11.

chamber of the cylinder 2 beneath the ram in the lifting operation of thejack, and which passes ac again intothe ram chamber in the lowering operation of the jack. The pump cylinder 8 and piston 9 are made 70 operative by means of theintake check 'valve 13 and the discharge check valve 14 i whereby the liquid is taken from the reservoir 12 and forced into the chamber 7 below the piston head 4; whereby a high pressure- 75 issecured and a great lifting power is imparted to the cylindrical ram 3. Y

The upper end of the cylindrical piston 3 -is closed with a disk to 15 screwed to its inner periphery. This sk top v15 is p ro- 80 vided witha threaded openingand stopper 16 through which the reservoir 12 may be filled. `The pump piston or plunger 9 is encircled with a proper packing ring and annular nut 17 where -it passes through the 85 disk top 15.

The ack head 18 with a serrated vcrown 19 is t readedon the outer periphery of' the upper end of the cylindrical piston 3. In this jack head is mounted the pump handle tached to the pump piston at 22. The jack can now be. operated with this handle or handle 20 asindicated at 23, an the jack be/ 1 pumped up with eatpowerp y V After the weig thas been lifted to the extent desired, thejack is lowered by means 100 of a relief check valve 24 connected with the pressure chamber 7 through a hole 25 drilledthrough the cylinder head 4 to which isthreaded a pipe extension 26 on whichv is mounted the release check valve 24. This check. valve 211 is released by means of a disk plate 27 mounted on the/pump piston 9 and suitably adjusted to press down the ball' of the check valve 24 by Vcontacting the head o f a pin extension therefromas 'may be seen 110 in Figure 1; JIt will be seen that @the pipe handle extension on its downward stro e Y contacts the upper end ofthe' cylindrical piston 3 just before the disk 27 contacts the release pin of check valve 24, but when slippedoff, the pump handle 20 can then be pushed down about one-eighthjof4 an inch flower which will .make the disk 27 release the check valve 24 and the liquid from the pressure chamber 7 will return to the reservoir 12 and the jack head will be lowered till free of the load thereon.

The drawing indicates each of the check valves 13, 14 and 24 to be spring actuated, the ball in each being carried on a disk 28 having a clover-'leaf shaped opening which allows the liquid to pass freely. around each ball when pushed back from its seat. By means of this spring actuated disk, 'each chck valve will act promptly and freely. This disk is shown in Figure 3. The liquid to be used in my jack-is preferably t'o be oil as commonly used in hydraulic jacks.

It will be observed that the pipe 26,

Y through which -the liquid is returned from the compression reservoir or chamber beneath the ram piston liead to the hollow chamber of the ram above itspiston head,

delivers the returningl liquid into the ram chamber at a. substantial distance above the ram piston head-so that in its return itmay be delivered abovelthe body of the liquid in the ram Vchamber instead of passing through a body of the liquid and thus a speedler` return of the ram to its lowermost position is obtained.

'It will also beobServed that the top. closureor head 15 of the hollow ram is indewhen necessary for any reason and the liquid within the hollow ram still be confined there- Y in without vspilling or waste -under dierent positions of the ram or jack.

While my h draulic japk as shown and described is esigned fory rebrassing car journals and making repairs thereto, it is to be observed`I do not'limit its use to this one specialty but reserve the right to make my ack for liftm the axles of automobiles or any other vehicle, and .to lift heavy weights of form ofjack as circumstances may Y and my lmprovements be applied therem;

.any kind where hydraulic jacks are required. I reserve theright to make any size and require My invention is to be ma e ofmaterials suitable to its use. Its construction is simpleand economical. Its parts cam .be easily'r put ,together and taken apartwhen necessary.4 Its operation .isdirect and powerful. Having described my invention, I claim- 1. A hydraulic jack'comprising a cylinder to receive a compression liquid, a hollow ram reciprocable in `said `cylinder having ai closure at one end and provided at the other end with a valved piston-head to control the passage of liquid back'and forth' between the interior of the ram and the cylinder in which the ram reciprocates, a pump positioned within the ram for forcing the liquid' from the ram into the chamber of the enclosing cylinder beneath the piston head of the ram, a jack-head demountably mounted on the upper end of the ram lindependently of its closure at that end, said closure4 serving to confine the' compression liquid within the hollow-ram when the jack-head is mounted and also when demounted, and'an operating lever'mounted on the jackhead and connected with a member of the pump to actuate the pump.

2l A` hydraulic jack comprising a cylinder 'to receive a compression li uid, a hollow rain reciprocable in said `cylinder and provided at one end with a yalved piston-head to control the passage of li uid back and forth between 'the interior of t e ram and the mounted on the jackshead and operatively" connected with a member of the pump to actuate the pump.

3. A hydraulic jack comprisin a cylinder to receive a compression liquid, a` ollow ram reciprocable in said cylinder and provided at i' one end with a piston-head formed with` a passage-way for quid to'pass from the ram to the space beneath the plston-head and an- ,I

other passageway for liquid to pass from beneath the piston-head to the interiorof the ram, a liquid conduit leading from the last named passage-way and terminating in the ram 4at a substantial'distance from the piston-.head to discharge the return liquid above the body of li uid-in the rama pump mounted on the piston-head and having valve-controlled passage-ways for comm cation with the interior ofthe ram and enclosing cylinder, said l uid conduit and passage-ways being provi ed with ball-valves ,seating agalnst sprin -pressed disks formed` wlth aterally exten gl openings, a' 'ckh ead mounted on the ram, and a lever lmounted on the jack-head vand operatively connected with a member 'of the pump to ac- I i at one end with a piston-head formed with a passage-way ,for 11 uid to pass from the ram to the space beneat the piston-head and anotherq passage-way for-hquid to pass -from t beneath the piston-head to the interior of the ram, a liquid conduit leading from the last named passage-way and terminating in the ram at a substantial di ance from the pisvalve-controlled passageway for communication with the interior of the ram and enclosing cylinder,` a jack-head mounted on the.

ram, a lever mounted on the jack-head and operatively' connected with 'a member of the ump to actuate the pump, a member ati l0 'tached to a plunger element of the pump and lying in the dpath of the valve' to the extended liqui conduit', *and displaceable means associated with the pump operating lever to normally prevent contact between `the plunger attached velement and valve of l5 .the extended liquid conduit v. and adapted to be displacedto permit conta'ct to open said valve.

RY BRONSON. 

